Magnehelic

[utspak]

Hello
I just purchased a 1979 Hatteras 48' LRC. It has a Magnehelic...what is this measuring?

Thanks
Stuart

 

[MikeP]

Since I never heard of it, I was interested...found this: http://magnehelic.net

I guess it measures what they say it measures; why this is useful on a boat is beyond me.

 

[Bill Allen]

Vacuum probably in your engine room. In a repower sometimes they'll use one to make certain you have enough air flow in the engine room. Bill

 

[bobk]

It can also measure crank case pressure. What is it connected to?

Bobk

 

[MikeP]

"Vacuum probably in your engine room."

Hmm - well that makes sense I guess - if you have some sort of filters/screens on the eng room air intakes the Magne what-sis could indicate if those screens are clogging with salt spray or whatever.

Guess you'd need two! (at least in a 53MY)

 

[jim rosenthal]

I think we all need at least one of these. Learned a new term, "baghouse", too. I guess a baghouse is the kind of house you have if you have a hosebag at home.....

 

[Boatsb]

Its used in HVAC to measure a pressure drop in the return side of the AC duct showing a blockage or poor design. It will measure air pressure drops.

I guess it could work for the ER to see if you have enough ventilation.

 

[MikeP]

They DO look cool!

 

[krush]

They are used all over in power plants. It's usually for measuring differential pressure in duct work or stuff like that. "bag house" in a power plant is the huge filter system that filters out particulates from the flue gas. Imagine a bunch of huge paper vacuum cleaner bags--it's very similar.

A clear tube with dyed water in it works fine too.